Lock



N. B. HUR

Aug. 27, 1935.

LOCK

Filed pril :5, 1929 INVENTOR I ATTORNEYS.

Patented Aug. 27, 1935 Lock f Norman B. .Hurd, New Britain, Conn., ass'ignorto The American Hardware;CorporatiomwNew Britain, Conn, a corporation; of Connecticut.

Application April. 3, 1929, Serial o, 352,1'1if 5 Claims. (01. 70-91).

v This invention relates to locks and in particu- ;lar to a lock adapted, to be'easily'disassembled to vhave its combination changed or' a new lock casing having a'difierent combination substituted. An object of the invention is to. provide a'lock incorporated with a knob and shank which may quickly disassembled bythe introduction of a special key within the usual keyv slot in a plug.

Itis. another object of the invention to provide a special interlocking or interengaging mem-'- ber movable to engaged and disengaged position by rotation of theplug to hold the-knob' and shank togetheriorpermit their separation, this I interlocking member being operated by a special key.

In certain places, such as ofiice buildingstand hotels-where tenants are constantly changing and Where it is 'desiredfto have difierent'keys for openingindividual rooms, it is convenient to have means whereby the'lockscan be'changed so that' a different. key will be required-to 'openit.

, The present invention relates to such devices in which the-lock maybe operated in the usual manner by a key, and, by means of a special key, the lock maybe disassembled so that a new casing requiring stituted. W A feature of importance "is that the shank and knob membersof the lock structureare provided with interengaging portions, one interen' gaging or interlocking portion carried directly by the shank and preferablycomprising small annular inside segmentalrecesses. The otherinterengaging member is preferablyin the form of i a sleeve having segmental arcuate lugs at the rear of the knob adaptedto fit .within: the segmentalrecesseswithin th'efshankl The sleeve is rotatably mounted upon butsec'ured against axial movement relative toijthe key plug in the lock cas ing. The means for'connectin'g and disconnecting' the knob and shank 'are therefore exceedin'gly simple, do notadd materiallyfto the weight, size orcost of manufacture of the constructionfi The constructionalso is such that the entire knobniay be'easily'detached'and lock casings maybe quickly removed and others substituted by 'a' workman unskilled in "lock making.

with the above and other objects in' view, my invention includes the features .of construction 'andope'ration set forth inthe-following specificationandj illustrated in the accompanying drawing. ,1 :0

' {In the accompanying drawing annexed hereto and? forming :a; part of this specification I have shown my invention embodied in a lock of the a different-key maybe sub=- pin tumbler type mounted within. a hollowrknob, but it will be understood that the invention can be otherwise embodied and" that the a drawing is not to be construed as defining or limitingjthe scope of the invention, theclaimsjappended to this specification being .relied upon f orthatpur Dose. P 1 In the "drawing i Fig. 1 is a longitudinalivievv partlyfin "section of lock mechanism, the membersiof jwhichgare shown in operativerelation to each other;

Fig.2 isa longitudinal view 'similar to Fig: 1

but showing the principal members of the lock disassembledand-separated;1 Fig. 3 is a perspective view of parts of the lock widely' separated. i

In the above-mentioned drawing'I have shown f but "one embodiment of the invention which now deemed preferable, but. it; is'to"be understood that changes and modifications" made .Within the s"c'ope, of the appended claims without departingfrom the spirit'o'f 'the' inven=,-

ti0n.' a Referring more in detail to the figurespr the drawing; I show a lock "comprising a [shank member in the form ofv a hollow spindle} adapted to be secured. to a door or other member and usu-' ally employed as a knob spindletofactuate the usual latch. Y Through this shank'extends longi 'tudinally. the square spindle 6 usually operated a key for operating the lock or latchmechanism,

or both,.associated.with the lock; Assuc'h'flock.

and latch-mechanism forms no part of thepres ent invention, reference to its construction'will beomitted.

Adapted to be mounted onlthe'spindlei "and.

' disengageably'held in positionjthereon is 'aknob 1. Within this knob is mounted the lock mechq ani sm'which is ofthe well known pin tumbler type. This mechanism comprises a lock casing.

8, having a plurality of pin tumblers fljof, the

usual type operated by a suitable key which fits. in aplug II] in the usualmanner. Specialmea'ns- I are provided for disengaging the. knob .from the 1 shank so that theknob withthe lockcasingmaybe readily removed from the shanks In'this sep; arated condition a new look casing and plugm ay be inserted requiring a different key to operateit ,In order to connect and disconnect the'k nob l y from the spindle 5, Ia sleeve I2 is rctatably.

mounted onfthe key plug lll and at the rear of the knob, shown clearly in Figs. 2 and 3,'are' provided on 'this 'sleeve'IjZ so that inf one position they-engage 'within recesses I 4 'in' the end of the spindle i Axially extending clutch lugs lil,

"rece separated by axially extending clutch lugs, and in another rotative position of the sleeve l2 they are disengaged from the recesses l4 and permit removal of the sleeve with the knob from the shank. The spindle 6 is connected to the plug II] or an extension thereon and maybe removable with said plug.

Fig. 1 shows the method of operating the lock in the usual manner. It will be noted that the ordinary or pass key l5 inserted within the plug is not long enough to affect the tumbler 16in the innermost recess. This tumbler and its driver I1, it will be noted, pass through the plug and sleeve so that in the position of the driver I! shown in Fig. 1 the sleeve is prevented from rotating relative to the lock casing. The-plug, however, is free to turn in the usual manner. These positions of the tumbler l6 and driver I1 are maintained so long as the knob and hollow spindle 5 are locked together by the lugs l3 en-- I gaging. within. the recesses. In order to lift the innermost tumblerso-that the sleeve will be free to rotate relative to thelock casing and compelled to rotate with the plug a special key I8 is reguired, shown in Fig. 2. I The effect of this key, as willbeseen from this figure, is to lift the innermos't tumbler i6 sufficiently so that the sleeve 12 and plug are locked together, whereupon the sleeve is freeto berotated relatively'to the lock "casingiBQThe special key shown in Fig. 2 is bitted similarly to that shown in Fig. l'so that it will properly operate the remaining tumblers of the loCkfWhen this special key I8 is inserted rotation of the plug .and the tumbler l6 will rotate the sleeve to disengage the lugsfromtheir recesses so that the lock may be disassembled'as shown in Fig. 2. o p ffJFig. 3 shows the preferred form of the recesses on theshank 5 and the lugs l3 onthe sleeve. As

willnbe seen, the {recesses M are cut into inner surfaces of forwardly extending projections LISP-l9 diametrically opposed to each other. The

lugsl3'areformed on the outer surface of the sleeve l2 designed to fit within the projections. Asjtlie "recesses andlugs extend'overv less than an arc of '90" the sleeve may be locked or unlocked relative to the'shank by rotating the sleeve approximately ,Inj the form shown, theshank 5 and knob 1 havejlongi tudinally engageable portions for pre-.

veritin .,relative rotation of these parts; that is say, the projections Iii-l9 on the shank 5 en- 'gage between complementary projections, 20 20 preferably 1 integrally carried by the knob I. when the projections l9 are fitted in'the recesses-between the projections 20-2 0, the knob and shank turri'together, and when the lugs-l 3 on "thejsleeyeH are positioned so as to lie within the recesses Ill-=14, the knob "and shank are securely locked together against relative longitudinal movement; f 7 h Inthe particular form shown, the projections 20Tarejprovided with recesses 2l-2| for the ption' of'the lugs l3 when the latter are lturnedoutof the recesses I l-i4 in the shank. Itj'will be seenthat when the lugs i3-l3 are en- :gag 'dfwithin the recesses 2| of the knob, the look casings will be held within the knob against akial displacement. After the knob has beenreproved from the shank, the sleeve .12 may be rotated'by, the special key l8 so. as to withdraw the lugs]? fromthe'recessesll, after which the lock niechanism 8 may be withdrawn rearwardly from {the-knob. When the lock casing is removed, the,

tumblers may be reset soas to provide a different combination and then replaced or a new cylinder or other lock mechanism having a different combination may replace the old one just Withdrawn. The parts may then be reassembled in the inverse order of disassembly as described.

I claim:

1. In a device of the character indicated, a knob supporting hollow spindle, aknob said knob and spindle having integral in'terfltting" axially extending" lugs 'to prevent relative rotation of said knob and'spindle, said lugs being provided with internal annular grooves registering with each other, said knob having an opening at the rear to receive a lock mechanism, a lock mechanism in said knob and'key operable means associated with said lock mechanism and including an annular interrupted lug means to bereceived in the annular registering grooves in the lugs on said spindle and knob for locking said knob and spindle together.

2. Ina device of the 'character'indicated, a knob supporting shank,+a:knob, said knob and shank having integral interfi'tting' axially exlocking and unlocking said lugs on said knob and shank. 1 1

3.-In a device'of the character indicated','a knob, .a knob supporting hollow spindle, said knob and spindle having'integr al interfltting' ax ially: extending clutch shoulders to'prevent when engaged independent rotation of said parts, key actuated mechanism 'insertible "and removable from said knob at the "rear'thereof including a key plug extending rearwardly beyond the knob, with clutch interlocking 'meansmounted on and rotatable by said plug to interconnect said clutch members to prevent axial separation of said parts, a key operable tumbler 'normallyoperating to prevent rotation of "said plug, another tumbler normally operating to positively hold said interlockingmeans in clutch'l'o'cking position while leaving the plug free to turn therein, saidtumble'r being displaceable by a key to free it froml clutch locking position 'and connect it to said plug for rotation thereby to rro sna clutch members] M f 4 Ina devicev of'the'ch'aracter described, o knob. a, knob supporting hollow spindle, said knob and spindlehaving integral interfitting ax iallyextending clutch members to prevent independent rotation of. said knob relatively to said spindle, key controlled lock 'me ch anism, said knob also having anopening at its rear toppermit the insertion and removal of said lock mechanism, said lock mechanism including a rotatable plug, tumbler mechanism therefor, clutch inter.- locking. means mountedv onsaid'plug and rotat able thereby to interconnectsaid clutch members to prevent axial separatiomof the knob from the spindle when said plug is rotated by one key, said plug being rotatable by a different key independently of said clutch interconnecting meansi- '5. In a latch of the character'described, a hollow spindle, a knob,faxially extending intercon- Gig necting clutch members to prevent independent rotation of the knob relatively to said spindle, a key plug mounted in said knob and projecting rearwardly therefrom into said spindle, means mounted on said plug and rotatable thereby when locked thereto to'interconnect the clutch members to prevent longitudinal separation of the knob from the spindle, key controlled mechanism operable by one key to lock said interconnecting means to said plug to cause it to turn with the plug to engage and disengage said clutch members, said key controlled mechanism being operable by a. diiferent key to permit the rotation of the plug independently of the clutch interconnecting means. a

. NORMAN B. 

